Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o valor de 1998 se o valor de 2000 for 25?
 ###Tabelas: CREATE TABLE south_korea_rok (south_korea_rok_id AUTO_INCREMENT PRIMARY KEY, City VARCHAR, Korean VARCHAR, Hanja VARCHAR, Province VARCHAR, Population (2010) INT) CREATE TABLE assembly_plants (assembly_plants_id AUTO_INCREMENT PRIMARY KEY, Company VARCHAR, Parent company VARCHAR, Parent headquarters VARCHAR, Plant VARCHAR, Models produced VARCHAR, Production (latest figures) VARCHAR) CREATE TABLE the_reform_of_the_national_water_and_sewerage_corporation (the_reform_of_the_national_water_and_sewerage_corporation_id AUTO_INCREMENT PRIMARY KEY, 1998 VARCHAR, 2000 VARCHAR, 2004 VARCHAR, 2007 VARCHAR, 2011 VARCHAR) CREATE TABLE past_board_members (past_board_members_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Chairman VARCHAR, Artistic Director VARCHAR, Performance Liaison VARCHAR, Secretary VARCHAR, Business manager VARCHAR, Production Stagemanager VARCHAR, Dramaturge VARCHAR, Public Relations VARCHAR, First/Second Year Rep. VARCHAR, Male Rep. VARCHAR) CREATE TABLE season_4:_1976–1977 (season_4:_1976–1977_id AUTO_INCREMENT PRIMARY KEY, Series # INT, Season # INT, Title VARCHAR, Original air date VARCHAR, Tape date VARCHAR)  
SELECT 1998 FROM the_reform_of_the_national_water_and_sewerage_corporation WHERE 2000 = 25